<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    fetch('http://localhost:3000/books/1')
      .then(res => res.json())
      .then(res => console.log(res))


    fetch('http://localhost:3000/books', {
      method: 'POST',
      headers: {
      'Content-Type': 'application/json'
    },
      body:JSON.stringify({bookname: 'jack', author: 'sdfsdf'})
    })
    .then(res =>res.json() )
    .then(res => console.log(res))
  </script>
</body>
</html>